In the derivation of the formula for the volume of a cone, the volume of the cone is calculated to be StartFraction pi Over 4 EndFraction times the volume of the pyramid that it fits inside.

A cone is inside of a pyramid with a square base. The cone has a height of h and a radius r. The pyramid has a base edge length of 2 r.

Which statement best describes where the StartFraction pi Over 4 EndFraction comes from in the formula derivation?

A. It is the ratio of the area of the square to the area of the circle from a cross section.
B. It is the ratio of the area of the circle to the area of the square from a cross section.
C. It is the difference of the area of the square and the area of the circle from a cross section.
D. It is the sum of the area of the square and the area of the circle from a cross section.